I am 8 months since I hit my head on a concrete wall and had a serious concussion. I developed tinnitus, light and sound sensitivity, extreme fatigue even after slightest physical activity. One neuro diagnosed me with PCS and gave me xanax .25 for a month. Yesterday I went to a new neurologist and he told me I have PTSD and gave me propranolol 60mg once a day. He told me that propranolol will help me with the sensitivity to bumps and jolts that I have since I hit my head ( Driving in a car drives me crazy as speed bumps and potholes send the impacts straight to my head) . I am reluctant to take it as I have read that it slows down the heart rate . Is the dose high ? What should I expect after taking it ? How do you think it will help with the sensitivity to bums and jolts ? Thank you